Screen Time Counter
Honest note: this only counts this page in this tab, resets on reload, and stores nothing: the counters live and die in your browser's memory.
How it works
仕組みA playful screen-time meter for exactly one page: this one. From the moment it loads, it counts total time here, time the tab was actually visible versus parked in the background, how often you switched away, idle stretches where mouse and keyboard went quiet for more than five seconds, and your longest unbroken focus streak. A hanko-style stamp passes cheerful judgement on your browsing style as the numbers evolve. Everything is counted live in your browser’s memory: nothing is stored, and a reload wipes the slate clean.
Browsers fire a visibilitychange event whenever a tab is hidden or shown, and every page can listen for it on itself. That is all this tool uses. It cannot see which tab you switched to, what you did there, or anything outside this page.
Any stretch longer than five seconds with no mouse movement, clicks, key presses, touches, or scrolling while the tab is visible. Reading slowly without moving the mouse will register as idle, because the tool measures input, not attention. Treat the number with humour.
No. The counters live in JavaScript variables in this tab and vanish when you reload or close it. There are no cookies, no localStorage entries, and no network requests. It is a novelty stat, not analytics.